SUCCESS AS AN ECONOMICS MAJOR.
Professor Newmark offers advice to incoming collegians. Whether at Harvard or North Carolina State or Northern Illinois, it's on point. I'd add only two things: take the second price theory course ("Intermediate Microeconomics" usually) as soon as you are eligible, and add George Stigler's Theory of Price and any edition of Alfred Marshall's Principles of Economics to your supplemental (almost typed recreational, that would be a plus) reading. For students thinking about an economics Ph.D. (as an incoming freshman???) there's a list of unresolved research questions in economics early on in Marshall that's still topical.